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(No Model.) 2 Shee'tsSheet 1.

J. A GROSHON. STEAM-BOILER.

No. 427,074. Patented May 6, 1890.

W/T/VESSES: IAHIE'IVTOR Arrom'vfsy (No Model.) 2 Sheets-Sheet 2. J. A.GROSHON.

STEAM BOILER.

No. 27,074. Patented May 6, 1890.

W/T/VESSES. INVENTOR v A BY W UNITED STATES ATENT" OFFICE.

JOHN A. GROSHON, OF NEIV YORK, N. Y., ASSIGNOR OF ONE-HALF TO RICHARD M.MACDONOUGII, OF SAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 427,074, dated May 6,1890.

1 Application filed geptember 11, 1889. Serial No. 323,634. (No model.)

To all whom it may concern:

Be it known that 1, JOHN A. GROSHON, a citizen of the United States, anda resident of New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Steam-Boilers, ofwhich the following is a specification.

The invention relates to improvements in boilers for generatingsteam,whether the latter is to be applied for power or heating purposes;and it consists in novel features of construction and arrangementhereinafter described an d claimed, by which the water may be rapidlyand efiectually heated and steam generated without excessive pressure atany individual part of the apparatus.

The invention will be fully understood from the detailed description 11ereinafter presented, reference being had to the accompanying drawings,in which- Figure 1 is a central vertical section of a boiler constructedin accordance with the invention, the section being taken on the dottedline X X of Fig. 2, which is a top view of the boiler, partly insection, on the dotted line Y Y of Fig. 1. of the boiler on the dottedline Z Z of Fig. 1. Fig. 4. is an enlarged detached top view, and Fig. 5a vertical sectional View, of one of a number of pipes through which thesteam and heat respectively pass, and hereinafter specifically referredto.

In the drawings, A designates the exterior shell or casing, and B aninterior shell or casing surrounding the parts which constitute theboiler, a space 0 being left between said casings for the purpose offorming an airchamber to prevent any undue heating of obj ects which maybe in proximity to the boiler.

The casing A is provided with apertures D, (shown by dotted lines inFig. 1,) through which the air from the space C may circulate.

The casings A B are surmounted by a suitable cover E, and are supportedupon the flange F, encircling the cast water-compartment G, which is inthe outline of a circle, and is provided at its inner, periphery withthe annular flange H, upon which the gratebars I are placed. Below thegrate-bars I there is provided the circular ash-pit J g and be- Fig. 3is a transverse section yond and inclosing said ash-pit is arranged thecircular casing K, between which and the ashpit is formed a space intowhich smoke and unconsumed gases from the fire may pass and escapethence through the opening L into the smoke-pipe M. Upon the inner upperedges of the casing K is formed the flange N, which serves to supportthe water-compartment G,

at its outer edges, while at its inner edges said compartment issupported upon the upper edges of the ash-pit J, as illustrated inFig. 1. The ash-pit J is in communication with the outlet-door O, andthe heating-chamber of the furnace above the grate-bars I may besupplied with fuel through the door P.

Above the water-compartment G is provided a compartment of similaroutline, (lettered (3,) which is in communication with the compartment Gby means of tubes B, through which the water may pass from the lower tothe upper compartment. W'ithin the tubes R are secured flues S, whichextend entirely through the water-compartmen ts G Q, and are open attheir lower and upper ends for the purpose of permitting the passagethrough them of the heat from the fire. Immediately above the door P isthe short water-compartment T, which receives a few of the pipes passingdownward from the compartment Q, it being impossible to extend said fewpipes continuously from the water-compartment Q to the compartment Gwithout interfering with the introduction of fuel upon the grate-bars I.The water-compartment T is connected at its ends with thewater-compartment G by means of the larger tubes V, in order that theWater from the compartment G may pass into the compartment T and thenceupward through the tubes R to the compartment Q. The tubes R arearranged in the outline of a circle encompassing the grate-bars I, andform the walls of the heating-chamber, within which the fuel is placed.

In the drawings I illustrate two rows of the tubes R, connecting thewater-compartments G Q; but it is obvious that as many rows or series ofthese tubes maybe employed as may be desired, according to the capacityit is necessary that the boiler should have. At the inner edges of thecircular water-oompartment Q is secured, by means of bolts a, thecircular steam-dome b, which is in communication with the compartment Qand is provided with the delivery pipe d, through which the steam ispermitted to pass to any desired point, either for use as power or forheating purposes. The water is fed to the compartment G through the pipee, and this pipe is connected with the customary gage f,

which is in communication through the pipe g with the water-compartmentQ. Centrally within the upper part of the compartment is secured thereservoir 72. for fuel, said reservoir being provided with a suitablecover and being open at its lower end and operating, when in use, in thesame manner as fuel reservoirs in base-burning stoves. The reservoir hneed not be employed in the boiler unless desired; but its retention maybe found convenient in instances where the boiler is employed forheating purposesas for supplying steam to the registers ofdwellingssince in such cases enough fuel may be fed in the morning tolast during the day, whereas without the reservoir 71. it might benecessary to frequently add fuel through the door P.

In instances where the boiler is used for generating power an attendantwould probing the fines immediately below said plugs,

as also more clearly illustrated in Fig. 5.

In the employment of the invention the fuel is placed upon thegrate-bars I and the fire started in the customary Way, while the wateris introduced through the pipe 3 into the-compartment G, whence itpasses upward through the series of tubes B into the compartment Q. Theheat, it will be observed,

comes into contact with the outer surfaces of the tubes R, and alsopasses downward through the flues S, and thus acts upon the Water asecond time. The volume of water in the tubes R is thus acted upon bothat its outer side and at its inner side and over the most extended areathat it seems possible to expose to the action of the heat. The heat andsmoke, after ascending to the upperpart of the apparatus, pass downwardthrough the fines S into the space between the ash-pit J and thesurrounding casing K, and thence escapes through the smoke-pipe M. Thesteam generated passes into the dome b, and is then delivered throughthe pipe (I.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a steam-boiler, the water-compartments G Q, located, respectively,at the lower and upper ends of the boiler, the series of vertical tubesR, connecting said compartments, and being separated from each other, soas to permit the circulation of heat entirely around them on its upwardpassage, and the flues S, open at their ends and passing through saidtubes, the latter inclosi'ng the heating-cham ber of the furnace,combined with the casing B, inclosing the tubes between saidwater-compartments, the inclosed ashpit and the outer casing K, forminga space beneath the compartment G, said space lead ing to thesmoke-pipe, substantially as set forth.

2. In a steam-boiler, the water-compartments G, Q, and T,connecting-tubes R and V, steam-dome b, and fiues S within the tubes Rand open at their ends, combined with the inclosing-casing and thegrate-bars Within the line of the tubes R, substantially as set forth.Signed at New York,in the county of New York and State of New York, this9th day of September, A. D. 1889.

JOHN A. GROSHON. \Vitnesses:

R. M. MAcDoNoUcH, (Inns. 0. GILL.

